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I thought that they had already determined that for shure? I heard on a TV doc. that as they were studying the things , they noticed that the dimensions of the bases on all the pyramids had a common denominator.... 3.124 (pi) its been awhile I not sure thats exactly correct . Any way they were mystified by this as pi wasnt reasoned out for thousands of years. The whole ancient alien crowd proclaimed this as evidence of their beliefs, certainly its clear , right? Well not so fast.. Turns out that the way they got their measurements was by using a wheel which had a mark on the rim and they simply rolled the thing "x" revolutions , turned 90 deg. went " x" rev. and so on. The story is that of course the dimensions were all related to Pi , not because they knew about that, but rather the measuring device was inherently related to PI. The whole space invader crowd had to go to therapy after that

WaldoPS I DONT MEAN TO MAKE ANY STATEMENTS ABOUT THE DEBATE OVER ANCIENT ALIENS, I DONT KNOW ABOUT IT, I WASNT THERE

That makes sense as far as fitment of the blocks but, that would require the limestone to be ground up like dust (or else you could see the peices) and also there would need to be a lot of lime cooked.

True Samhill, even modern forms for foundations bow and bend under the weight of the concrete. If it was such lightweight concrete would it have lasted this long? And the strenght of concrete is the steel in it. Without it they would have cracked and fallen apart long ago under their own weight.

Even if they could have done it concrete needs a slow damp cure for best results, I don't think blocks that size would have lasted long enough to get the forms off yet alone for centuries of being in heat & sand blasting.